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diff --git a/Documentation/devicetree/bindings/arm/samsung/wakeup-eint.txt b/Documentation/devicetree/bindings/arm/samsung/wakeup-eint.txt new file mode 100644 index 000000000000..52aa0493914a --- /dev/null +++ b/Documentation/devicetree/bindings/arm/samsung/wakeup-eint.txt @@ -0,0 +1,152 @@ +* Samsung GPIO Wakeup Interrupt Controller + +This document is split into following sections. + +[1] Samsung Exynos4 GPIO Wakeup Interrupt Source Controller +[2] Samsung Exynos5 GPIO Wakeup Interrupt Source Controller + + +[1] Samsung Exynos4 GPIO Wakeup Interrupt Source Controller + +Samsung Exynos4 processor supports 32 external wakeup interrupt sources. First +16 of these interrupts are directly connected to GIC and the rest 16 of the +interrupts are grouped together to deliver a single interrupt to GIC. + +Required properties: + + - compatible: should be "samsung,exynos4210-wakeup-eint". + + - reg: physical base address of the controller and length of memory + mapped region. + + - interrupt-controller: Identifies the node as an interrupt controller. + + - interrupt-cells: Specifies the number of cells required to specify the + interrupt source number. The value of should be <2>. The first cell + represents the wakeup interrupt source number and the second cell + should be zero (currently unused). + + - interrupts: List of interrupts generated by the gpio wakeup interrupt + controller which are connected to a parent interrupt controller. The + format of the interrupt specifier depends on the interrupt parent + controller. + +Optional properties: + + - interrupt-parent: phandle of the parent interrupt controller, required + if not inheriting the interrupt parent from the parent node. + +Example: + + The following example is from the Exynos4210 dtsi file. + + wakeup_eint: interrupt-controller-wakeup-eint { + compatible = "samsung,exynos4210-wakeup-eint"; + reg = <0x11000000 0x1000>; + #interrupt-cells = <2>; + interrupt-controller; + interrupts = <0 16 0>, <0 17 0>, <0 18 0>, <0 19 0>, + <0 20 0>, <0 21 0>, <0 22 0>, <0 23 0>, + <0 24 0>, <0 25 0>, <0 26 0>, <0 27 0>, + <0 28 0>, <0 29 0>, <0 30 0>, <0 31 0>, + <0 32 0>; + }; + + +[2] Samsung Exynos5 GPIO Wakeup Interrupt Source Controller + +Samsung Exynos5 processor supports 32 external wakeup interrupt sources. First +16 of these interrupts are directly connected to GIC and the rest 16 of the +interrupts are grouped together to deliver a single interrupt to interrupt +combiner controller. + +Since the wakeup interrupts has two interrupt parents, a interrupt nexus +child node is used that includes a interrupt-map used to translate wakeup +interrupt specifiers into gic and combiner domain interrupts. + +Required properties: + + - compatible: should be "samsung,exynos5210-wakeup-eint". + + - reg: physical base address of the controller and length of memory + mapped region. + + - interrupt-controller: Identifies the node as an interrupt controller. + + - interrupt-cells: Specifies the number of cells required to specify the + interrupt source number. The value of should be <2>. The first cell + represents the wakeup interrupt source number and the second cell + should be zero (currently unused). + + - interrupts: List of interrupts generated by the gpio wakeup interrupt + controller. Since both gic and combiner controllers are interrupt + parents, a interrupt nexus child node is used to translate the interrupt + specifiers into respective gic and combiner interrupt domains (see below). + The interrupt specifier should be two cells - the first cell should be the + interrupt number originating from the wakeup controller and the second + cell should be zero (unused). + + - interrupt-parent: The phandle of the interrupt nexus child node. + + - interrupt-nexus child node: This node is used to translate the interrupt + specifiers of the wakeup interrupt controller node to the respecitive + gic or combiner interrupt domain. The interrupt nexus node should include + the following properties. + + - interrupt-cells: Specifies the number of cells required to specify the + interrupt source number. The value of should be <2>. The first cell + represents the wakeup interrupt source number and the second cell + should be zero (currently unused). + + - #address-cells: value of this property should be zero. + + - #size-cells: value of this property should be zero. + + - interrupt-map: The interrpt-map specifies how interrupt specifiers are + translated. There should be a interrupt-map entry for each interrupt + generated by the wakeup interrupt controller. The format of each entry + in the interrupt map should be + + <#intr 0 parent-phandle parent-interrupt-specifier> + + where #intr is one of the entries in the 'interrupts' property of the + parent node. + + +Example: + + wakeup_eint: interrupt-controller@11400000 { + compatible = "samsung,exynos5210-wakeup-eint"; + reg = <0x11400000 0x1000>; + interrupt-controller; + #interrupt-cells = <2>; + interrupt-parent = <&eint_nexus>; + interrupts = <0x0 0>, <0x1 0>, <0x2 0>, <0x3 0>, + <0x4 0>, <0x5 0>, <0x6 0>, <0x7 0>, + <0x8 0>, <0x9 0>, <0xa 0>, <0xb 0>, + <0xc 0>, <0xd 0>, <0xe 0>, <0xf 0>, + <0x10 0>; + + wakeup_map: interrupt-map { + #interrupt-cells = <2>; + #address-cells = <0>; + #size-cells = <0>; + interrupt-map = <0x0 0 &combiner 23 0>, + <0x1 0 &combiner 24 0>, + <0x2 0 &combiner 25 0>, + <0x3 0 &combiner 25 1>, + <0x4 0 &combiner 26 0>, + <0x5 0 &combiner 26 1>, + <0x6 0 &combiner 27 0>, + <0x7 0 &combiner 27 1>, + <0x8 0 &combiner 28 0>, + <0x9 0 &combiner 28 1>, + <0xa 0 &combiner 29 0>, + <0xb 0 &combiner 29 1>, + <0xc 0 &combiner 30 0>, + <0xd 0 &combiner 30 1>, + <0xe 0 &combiner 31 0>, + <0xf 0 &combiner 31 1>, + <0x10 0 &gic 0 32 0>; + }; + }; |